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摘要：
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采用金相分析、断口分析、有限元模拟、试验验证相结合的方法，对某航空发动机封严圈锻件分模面位置裂纹产生的原因进行了分析和验证。结果表明：分模面转接R处裂纹的产生主要与预锻坯尺寸有关，如环形坯料局部厚度偏大，则模锻成形过程中局部多余金属形成飞边时，R处流动速度差异增大，附加应力也随之增大，当附加应力与外界作用的应力之和超出材料的强度极限时即产生裂纹。此外，模具飞边槽圆角半径r值和桥部高度尺寸偏小，会增大裂纹出现的倾向。改进环形坯料壁厚控制的工艺方法，最大壁厚不大于21 mm；模具飞边槽桥部高度增加至8 mm，圆角半径增大至5 mm，同时控制锻坯的加热过程、模具温度和润滑等可有效预防此锻造裂纹。
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The causes of cracks on mold parting surface for sealing ring forgings in aero-engine were analyzed and verified by a combination of metallographic analysis, fracture analysis, finite element simulation and experimental verification. The results show that the cracks at transition R position of mold parting surface are mainly related to the sizes of pre-forging billet. When the local thickness of ring billet is larger, the difference of flow velocity at R position increases when the flash is formed by local excess metal during die forging process, and the additional stress also increases. However, the cracks occur when the sum of additional stresses and external forces exceeds the strength limit of material, and the values of corner radius r and bridge height of mold flash groove are a little small which increase the tendency of cracks. Thus, the process method for the wall thickness control of ring billet is improved with the maximum wall thickness no more than 21 mm, the bridge height of mold flash groove up to 8 mm and the corner radius up to 5 mm, meanwhile, the forging cracks are prevented efficiently by controlling the heating process of billet, the mold temperature, the lubrication and so on.
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基金项目：
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作者简介：
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秦婷婷（1991-），女，学士，工程师，E-mail：1808491537@qq.com
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